Mail Archives: opendos/2002/09/11/19:10:37
This message was written some time ago, but due to the new
subscribing policies (that I agree with!) I was not able to send...
Hi Michael,
Maybe I can give you an explanation, as I have already developped
both ctr monitors and video boards.
Your display is didigned for something like 1024 lines when operating
at it's _nominal_ resolution. To make this work and have a good readability
the dot on the screen needs to have a fisical diamiter slightly over 1/1000
of the screen size or the image would get blured.
When you use text mode, the scanning is streched so that the standard
640 lines are displayed across the whole screen. There is a mismatch
between the dot diameter and the line spacing which produces a dark
interval between the displayed lines.
I don't know any simple cure for this. The theoretical solution is to
make the screen double the number of lines and repeat the same info
in the intermediate lines. I never heard of anything like it :(
Alain
From: "Michael Snowden" <mss14 AT cantua DOT canterbury DOT ac DOT nz>
> I am having a serious problem in getting a good crisp display using
> DOS. The figures look like the ones we had in the mid-80s, i.e., each
> character is composed of numerous little horizontal parallel lines.
> I suspect the video card is the source of the problem, not the
> monitor, because the display is alright when used with the Linux hard
> disk. The video card is a 32 Mb AGP TNT-2 M64.
>
> Which video card should I try to get a sharp text display for DOS and
> yet will still work with Linux?
>
> Michael Snowden
> mss14 AT cantua DOT canterbury DOT ac DOT nz
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